/* Copyright (C) 2013-2021 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.learnlib.api.oracle;

/**
 * A filter is an oracle that can be used as the middle element in a chain of oracles.
 *
 * @param <I>
 *         input symbol class
 * @param <D>
 *         output domain type
 *
 * @author falkhowar
 */
public interface Filter<I, D> extends MembershipOracle<I, D> {

    /**
     * sets oracle for processing membership queries.
     */
    void setNext(MembershipOracle<I, D> next);

}
